_Secondary_struct_list.Sf_category
| Description | Category definition for the information content of the save frame |
| Details: | |
| category of the parent saveframe (necessary for NMR-STAR to relational database mapping) | |
| Parent saveframe | secondary_structs |
| Data type | code |
| DB table | Secondary_struct_list |
| DB column | Sf_category |
| DB type | VARCHAR(31) |
| NULL allowed | no (mandatory) |